3.3.B Proteins - Breakdown and absorption

What is the primary function of villi in the small intestine?

• To increase surface area for nutrient absorption

• To produce digestive enzymes

• To transport food to the stomach

• To break down proteins into amino acids

Which of the following is NOT a function of digestive enzymes?

• Unfolding proteins in the stomach

• Rearranging atoms in molecules

• Breaking down carbohydrates

• Transporting amino acids into the bloodstream

How many essential amino acids must be obtained from food?

• 9

• 11

• 20

• 15

What process allows cells to make new proteins using amino acids?

• Protein synthesis

• Digestion

• Ingestion

• Absorption

Which of the following amino acids is considered nonessential?

• Alanine

• Histidine

• Leucine

• Valine

What role does water play in the digestion of proteins?

• It reacts with amino acid chains to break them into smaller chains

• It transports proteins to the small intestine

• It unfolds proteins in the stomach

• It absorbs nutrients into the bloodstream

Where are the instructions for building proteins encoded in our cells?

• DNA

• RNA

• Proteins

• Enzymes